Ultrasound works magicOne tool that South Dakota beef producers Blane and Cindy Nagel can''t do without is an ultrasound machine. All heifers on their 300-head Maine-Anjou herd are scanned each May and then bred according to their muscle scores and marbling levels. Ultrasound data for all sale bulls is provided to potential buyers. "As a breeder, I use it as a mating tool," says Blane, who farms near Springfield. "The buyers of my bulls use shreddertornadochipper it as a selection tool." Nagel pays most attention to the marbling around the ribeye area. His cattle naturally muscle well, so he is looking for those who are also heavily marbled.

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